大家好,又见面了,我是你们的朋友全栈君。
前提:
- 创建一个xxx.py的文件 文件头为
#!/usr/bin/python3
# -*- conding= utf-8 -*-
print('hello world')
- 更改权限
chmod 777 xxx.py
这样python文件就可以执行了
代码语言:javascript复制ubuntu@VM-0-10-ubuntu:~/script$ ./test.py
hello world
crontab 使用
- 编辑、添加crontab
crontab -e
第一次执行会让用户选择编辑器,自己根据喜好选择编辑器 进入编辑会显示如下代码:
1 # Edit this file to introduce tasks to be run by cron.
2 #
3 # Each task to run has to be defined through a single line
4 # indicating with different fields when the task will be run
5 # and what command to run for the task
6 #
7 # To define the time you can provide concrete values for
8 # minute (m), hour (h), day of month (dom), month (mon),
9 # and day of week (dow) or use '*' in these fields (for 'any').#
10 # Notice that tasks will be started based on the cron's system
11 # daemon's notion of time and timezones.
12 #
13 # Output of the crontab jobs (including errors) is sent through
14 # email to the user the crontab file belongs to (unless redirected).
15 #
16 # For example, you can run a backup of all your user accounts
17 # at 5 a.m every week with:
18 # 0 5 * * 1 tar -zcf /var/backups/home.tgz /home/
19 #
20 # For more information see the manual pages of crontab(5) and cron(8)
21 #
22 # m h dom mon dow command
23 #* * * * * /home/ubuntu/python/Simple_review_system/component/emailer.sh >> /home/ubuntu/script/review_emailer.log 2 >&1
~
- 查看crontab命令
crontab -l
- 定时执行任务
- 命令行输入
crontab -e
:进入crontab编辑模式 - 在文件末添加要定时执行的代码
格式:
{minute} {hour} {day-of-month} {month} {day-of-week} {full-path-to-shell-script} ( >> {full-path-to/xxx.log 2>&1})
(括号里面可选项,添加日志) - minute: 0-59
- hour: 0-23
- day-of-month: 0-31
- month : 1-12
- day-of-week: 0-7 (*表示每分钟,每小时,每…)
示例:
- 每天02:00执行任务
0 2 * * * /path/xxx.py
- 每天5:00和17:00执行任务
0 5,17 * * * /path/xxx.py
- 每分钟执行一次任务
* * * * * /path/xxx.py
- 每周日17:00执行任务
0 17 * * sun /path/xxx.py
- 每10分钟执行一次任务
*/10 * * * * /path/xxx.py
- 在特定的某几个月执行任务
* * *jan,may,aug * /path/xxx.py
- 每30秒执行一次任务
* * * * * /path/xxx.py
* * * * * sleep 30; /path/xxx.py
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